In a binary search tree, what is the time complexity for searching for an elemen
Practice Questions
Q1
In a binary search tree, what is the time complexity for searching for an element in the average case?
O(1)
O(n)
O(log n)
O(n log n)
Questions & Step-by-Step Solutions
In a binary search tree, what is the time complexity for searching for an element in the average case?
Step 1: Understand what a binary search tree (BST) is. It is a data structure where each node has at most two children, and the left child is less than the parent node, while the right child is greater.
Step 2: Know that in a balanced BST, the height of the tree is kept low, which helps in efficient searching.
Step 3: Realize that to find an element, you start at the root and compare it with the target value. If the target is smaller, you go left; if it's larger, you go right.
Step 4: Each time you move down one level in the tree, you eliminate about half of the remaining nodes from consideration.
Step 5: In a balanced BST, the maximum height is log base 2 of n (where n is the number of nodes), which means you can find an element in about log n comparisons on average.
Step 6: Therefore, the average time complexity for searching for an element in a balanced binary search tree is O(log n).
